Astronauts perform spacewalk aboard the ISS, and more of today's top videos

5,000 extinct-in-the-wild and critically endangered tropical snails bred at conservation zoos across the world have been returned to their Fre…

Trees can grow to become some of the oldest living organisms on our planet. In fact, the average redwood lifespan is around 800 to 1,500 years…

Sudan's two warring factions said on Thursday they would prolong a ceasefire agreement by 72 hours, but violence again rocked the capital Khar…